Answer:
Ionic radius is greater than atomic radius in an anion.
Option B is correct because ionic radii increase for anions and decrease for cations compared to the neutral parent atoms, due to changes in electron-electron repulsion.
The correct answer to the question about the properties of atomic and ionic radii is B. Ionic radius is greater than atomic radius in an anion. This is because when an atom gains electrons to become an anion, the increase in electron-electron repulsion causes the ion to expand. Conversely, when an atom loses electrons to become a cation, it becomes smaller than the neutral atom because the reduction in electron-electron repulsion allows the remaining electrons to be pulled closer to the nucleus by its unchanging positive charge. This result is consistent with the observations made in the provided information.
Very easy physics maths about current and other stuffs only one question please help me
Three identical resistors of resistance 3 ohms are connected in series in a circuit. What is the total voltage of the battery if the current in the circuit is 2A ?
Answer:
The total voltage of the circuit is 18 volts.
Explanation:
We have, three identical resistors of resistance 3 ohms are connected in series in a circuit.
For a series combination, the equivalent resistance is given by the sum of individual resistances i.e.
[tex]R_{eq}=R_1+R_2+R_3\\\\R_{eq}=3+3+3\\\\R_{eq}=9\ \Omega[/tex]
Let V is the voltage of the battery if the current in the circuit is 2 A. So,
[tex]V=IR[/tex]
[tex]V=2\times 9\\\\V=18\ V[/tex]
So, the total voltage of the circuit is 18 volts.
Which of the following items involve a wedge?
Check all that apply.
A. A chisel
B. An axe
C. A knife.
D. A hairbrush
A chisel, an axe, and a knife all include wedges in their design, as they have tapered edges that are used to cut, split, or pierce materials. A hairbrush does not serve this function and is not a wedge.
A wedge is a simple machine that consists of a piece of material, typically metal or wood, with a sharp edge that tapers to a point or edge. It converts force applied to its blunt end into forces perpendicular to its inclined surfaces. The wedge is used to cut, split, or pierce other objects or materials. Based on the information provided:
A chisel is indeed a wedge as it is a hand tool with a blade that is struck with a mallet to cut or shape wood, stone, or metal.An axe is a tool with a wedge-shaped blade that is used to split or cut wood.A knife is a wedge with a sharp edge designed to cut or slice through materials.A hairbrush is not a wedge; it does not have a tapered edge used for cutting or splitting materials.Examples of other non-listed tools that function as wedges could include a screwdriver for opening cans, a garden fork for piercing soil, or a pair of pliers for gripping and cutting.
ASAP NEED HELP PLEASE
A - 4.33 * 10 ^ - 6 C charge is 0.525 m from a -7.81 * 10 ^ - 4 C charge. What is their electric potential energy? ( include + or - ) ( unit J )
Answer:
57.91
Explanation:
The electric potential energy between the two charges is approximately 57.75 Joules.
To calculate the electric potential energy between two point charges, we can use the formula:
Electric potential energy (U) = k * |q1 * q2| / r
where:
k is Coulomb's constant ≈ 8.99 * [tex]10^9[/tex] N m²/C²
q1 and q2 are the magnitudes of the two charges (in Coulombs)
r is the distance between the charges (in meters)
Given:
q1 = 4.33 * [tex]10^(-6)[/tex] C
q2 = -7.81 * [tex]10^(-4)[/tex] C
r = 0.525 m
Now, let's calculate the electric potential energy (U):
U = (8.99 * [tex]10^9[/tex] N m²/C²) * |(4.33 * [tex]10^(-6)[/tex]C) * (-7.81 * [tex]10^(-4)[/tex] C)| / 0.525 m
U = (8.99 * [tex]10^9[/tex] N m²/C²) * |(-3.38 * [tex]10^(-9)[/tex] C²)| / 0.525 m
U = (8.99 * [tex]10^9[/tex] N m²/C²) * 3.38 * [tex]10^(-9)[/tex] C² / 0.525 m
U = (3.03362 * [tex]10^1[/tex] N m²/C²) / 0.525 m
U ≈ 57.75 J
The electric potential energy between the two charges is approximately 57.75 Joules.
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Mateo makes a table of the symbols that represent the parts of an electric circuit.
A 2-column table with 4 rows. The first column labeled Symbol has entries circle with an X in it, short horizontal line at each end with a stack of vertical lines in the middle, which are from left to right very short short very short short, a short horizontal line then a small circle then a short line pointing up at about 45 degrees then a short gap then a small circle then a short horizontal line, a sort horizontal line then a zigzag then a short horizontal line. The second column labeled Component has entries empty, check mark, empty, empty.
What label should Mateo place in the marked cell?
Uses electrical energy
Provides electrical energy
Measures electric current
Controls electric current
Answer:
B provides electrical energy
Explanation:
Mateo should place in the column of marked cell is provides electrical energy.
What is electric current?The current is a stream of electrons flowing from the positive terminal of the battery to the negative terminal.
The battery provides the voltage difference to make the current flow. The zigzag line shows the resistor which controls the electric current. The switch sign is used to stop the current at its position.
Thus the marked sign in front of battery or voltage source provides the electrical energy.
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A chipmunk with a mass of 2 kg sits on a branch that is 10 m off the ground.
What is its gravitational potential energy? The acceleration of gravity is 9.8
m/s?
I hope I'm not too late.
GPE = mass * gravity * height
GPE = 2 kg * 9.8 m/s * 10
GPE = 196 Joules
Answer:196
Explanation:
A pet owner dropped some new fish into a pond. Several species of fish lived in the pond, but within a few months, only members of the new
species survived. What best explains why this happened?
A
Too many fish caused an imbalance in the ecosystem, so the food web was affected.
B. All new species have an advantage in an ecosystem.
c. The new species was probably bigger than the other fish in the pond.
D. All of the species were dying out, and the new species was the last to survive.
Answer: A or C
Explanation:
Technical physics.... I need someone’s wizardry
The speed of the truck, given the frequency and the speed of sound would be 6.2 m/s
Given:
Fs = 500 Hz (source frequency)
Fo = 480 Hz (observed frequency)
v = 348 m/s (speed of sound)
Using the Doppler effect formula:
Fo = Fs × (v / (v + vs))
where vs is the source velocity (truck velocity), we can solve for vs:
480 = 500 × (348 / (348 + vs))
Simplifying and solving for vs:
0.96 = 348 / (348 + vs)
0.96(348 + vs) = 340
334.08 + 0.96vs = 340
0.96vs = 5.92
vs = 5.92 / 0.96
vs ≈ 6.2 m/s
Therefore, the truck is moving away from the observer at a speed of approximately 6.2 m/s.
When a certain isotope, such as Pu-239, is hit by a neutron, it will always split
into the same smaller nuclei.
true or false?
Answer:false
Explanation:
Atoms don’t always fission the same way. You saw three different possible fission reactions for U-235
Answer: F
Explanation:
if a train is slowing down it is accelerating true or false
Yes, the statement is true. When a train is slowing down, it's experiencing a form of acceleration known as negative acceleration or deceleration.
Explanation:
That's a great question about the concept of acceleration. The answer is True. Acceleration in Physics is defined as the rate of change of velocity per unit of time. This change in velocity could be either an increase (speeding up) or a decrease (slowing down). When a train is slowing down, it's indeed undergoing a type of acceleration called deceleration, which is a negative acceleration.
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When a train is slowing down, it is indeed accelerating, but in a negative direction. This is known as deceleration, and while it means the object is slowing down, it is technically still considered acceleration in physics.
Explanation:The statement is true; when a train is slowing down, it is indeed accelerating - but in a negative direction. Acceleration, in physics, is a change in velocity, which includes either a change in its magnitude or direction. When the train slows down, the change in velocity is negative, and we refer to this as negative acceleration or deceleration. Even though the term 'deceleration' can sometimes cause confusion, from a physics standpoint, it's still considered acceleration because acceleration is a vector and has a direction associated with it.
As an example, let's take a look at a train moving with an initial velocity of 20 m/s. After some time, its speed drops to 10 m/s. Here, there's a negative change in velocity, so the acceleration will also be negative.
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A car is moving at constant speed on the
freeway. The driver sees a patrol car at time
ti and rapidly slows down by around 10 miles
per hour. After continuing at this speed for
a few minutes, the driver at time ty quickly
accelerates to the original constant speed.
Which graph correctly describes the car's
acceleration a(t) as a function of time? Take
the forward direction of motion as positive.
The graph that correctly describes the car's acceleration as a function of time is (c).
The graph that correctly describes the car's acceleration as a function of time is (c). In this graph, the acceleration has a constant value for a certain time interval, indicating constant acceleration. The slope of the velocity vs. time graph is constant during this interval.
The moon orbiting the earth, an apple falling, or a car stopping at a traffic light are a few instances of acceleration. These illustrations help us to understand that acceleration happens when a moving object changes direction or experiences a speed increase or reduction.
The acceleration unit in the SI is metres/second2 (m/s2). Newton's Second Law, which states that "The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass," establishes a relationship between force (F), mass (m), and acceleration (g).
The following two formulas are equivalent: D = m / V and V = m / D.
true or false
Answer:
the answer is true
Explanation:
Both equations are derived from the density formula, hence it is TRUE that they are equal.
In order to know whether the two formulas are equivalent, we need to determine the formula for calculating the density of a substance
Density = Mass/Volume
D = m/V
Make V the subject of the formula
[tex]D = \frac{m}{V}\\DV = m\\[/tex]
Divide both sides by D
[tex]\frac{DV}{D} =\frac{m}{D}\\ V = \frac{m}{D}[/tex]
Since both equations are derived from the density formula, hence it is TRUE that they are equal.
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Which two actions best demonstrate taking responsibility?
Answer:
Leading your people into the right direction, and always knowing what is best for you and your people.
Explanation:
Which of the following groups of elements is ranked from least reactive to most reactive?
A. Sr, Ca, Mg, Be
B. K, Na, Li, H
C. Li, Na, K, Rb
D. K, Ca, Sc, Ti
Answer:
C. Li, Na, K, Rb
Explanation:
Lithium < Sodium < Potassium < Rubidium
The ranking from least reactive to most reactive for a group of elements is C. Li, Na, K, Rb. All these elements are alkali metals in the first group of the periodic table, with reactivity increasing from Lithium to Rubidium.
Explanation:In the periodic table, generally speaking, reactivity increases as we go from right to left in a period and from top to bottom in a group. Thus, considering these directions, the group of elements ranked from least reactive to most reactive is C. Li, Na, K, Rb.
Here's why: all these elements are alkali metals found in the first group of the periodic table. Lithium (Li) is the smallest and least reactive among these. Sodium (Na) is larger and more reactive than lithium. Potassium (K) is even larger and more reactive, and finally Rubidium (Rb) is the largest and most reactive among them.
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How does water pollution in one area affect water and organisms elsewhere?
Answer:
Infectious diseases can be spread through contaminated water. Some of these water-borne diseases are Typhoid, Cholera, Paratyphoid Fever, Dysentery, Jaundice, Amoebas and Malaria. Chemicals in the water also have negative effects on our health.
Explanation:
Final answer:
Water pollution adversely affects ecosystems, leading to harmful effects like eutrophication and dead zones. Pollutants can accumulate in the food chain affecting human health, and contaminated waterways can disrupt recreation and drinking water quality.
Explanation:
Water pollution has significant repercussions on ecosystems and can lead to broad ecological consequences, affecting water quality and the organisms residing in and around affected areas. Notably, the pollutants either from point sources or nonpoint sources can lead to a chain of detrimental events. An example of this is eutrophication, which is an over-enrichment of water bodies with nutrients leading to excessive growth of algae and subsequent depletion of oxygen (anoxia), causing harm to various aquatic species.
Furthermore, the pollution can result in the accumulation of harmful substances, like mercury, within the food web, which potentially leads to the consumption of carcinogens by animals—including humans. The effects of water pollution are far-reaching; contaminated rivers can negatively impact recreational activities, drinking water supplies, and the overall health of the ecosystem. Specific instances, such as the Cuyahoga River catching fire, underpin the urgent need for better water management policies to prevent such environmental crises.
Agricultural practices also contribute to water pollution with runoff carrying pesticides and fertilizers that can cause algal blooms, resulting in dead zones—areas in water bodies where life cannot be sustained due to low oxygen levels. These impacts are often not confined to a single locality but can affect regions downstream and ultimately contribute to global environmental problems.
ANSWER THIS ASAP Which inclined plane would require the greatest force to push the box onto the truck?
A) A
B) B
C) C
D) D
Answer: [D] (Clarification: The one with the steepest incline)
Answer: A. 22 inches
Explanation:
I just took the test and 22 was the correct answer
(NEED HELP! +28pts and BRAINLIEST) The total energy output of a star per second is called ________. Select all that apply.
a. Power
b. Luminosity
c. Visible Radiation
d. Electromagnetism
Answer:
luminosity
Explanation:
Answer:
The answer would be B.) Luminosity.
Explanation:
The luminosity of a star is basically, as the question says, the total energy output of a star per second. The luminosity is also the brightness of a star. If a star has a lot of energy, the star would be bright.
Which of the following is NOT a type of electromagnetic wave
Answer:
Where's the options?
Explanation:
Answer:
where are the options so we can answer
(free point thanks)
Explanation:
A 80-kg person sits on a 2.7kg chair. Each leg of the chair makes contact with the floor on a circle that is 1.3 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming that the weight is evenly distributed.
Answer:
need help with this 2
Explanation:
pls hellp
Explanation:
Assuming the chair has four legs,
Area = (πr²)
= 1.33 m²
Pressure = Force/Area
= 827/1.33
= 621.8 Pa
Which statement is part of Bohr's atomic model?
Answer:
the answer is A. electrons absorb or emit light when they change energy levels.
Explanation:
brainliest please? :))
Mr.Brown’s class is learning about physics and chemical changes. After reading the passage, the students had to pick out the model of the physical change. Can you help them? Pick the correct model and give a reason for your choice.
A.
B.
C.
D.
Crust describes the outermost shell of a terrestrial planet. Earth’s crust is relatively thin, just 40-kilometers (25-miles) deep. Earth's crust can be divided into two types: continental and oceanic. How do these two types of crust differ? All BUT ONE could apply.
Answer:
"Crust" refers to a
terrestrial planet's outermost surface.
In general, the Earth's crust is divided into
older, thicker continental crust and younger, denser oceanic crust.
...
The thin, 40-kilometer (25-mile) deep crust of our planet — just
1 per cent of Earth's mass — contains all known universe existence.
Explanation:
Continental crust is thicker, 22 miles (35 km) on average and less dense than oceanic crust, which accounts for its mean surface elevation of about 3 miles (4.8 km) above that of the ocean floor (Archimedes’ principle). Continental crust is more complex than oceanic crust…
Earth's crust divides into the oceanic and continental crust. Oceanic crust is thinner, made of basalt, and mainly lies under the oceans. Continental crust is thicker, comprised mostly of granite, and partly submerged under oceans.
Explanation:The Earth's crust can be divided into oceanic and continental crust. Oceanic crust, covering 55% of the Earth's surface, lies mostly under the oceans. It is typically around 6 kilometers thick and is composed of volcanic basalt rocks. These rocks are produced from the cooling of volcanic lava and primarily consist of silicon, oxygen, iron, aluminum, and magnesium.
On the other hand, the continental crust covers 45% of the Earth's surface and is thicker—ranging from 20 to 70 kilometers. Part of the continental crust is also submerged under oceans. Rather than basalt, it is made up predominantly of granitic rocks, which are a different class of volcanic silicates. Both types of crust have densities of around 3 g/cm³., which is thrice the density of water.
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All of the following are examples of convection currents, except:
A. Warm air rising
B. Cold water sinking to the bottom of the lake
C. Water flowing through pipes
D. Steam from hot soup rising into the air
Answer: C.
Water flowing through pipes
Explanation:
Convection current is a type of heat transfer that occurs in liquids and gases.
It involves the physical movements of liquids or gases molecules. Convection happens when there is a difference in temperature between two parts of a liquid or gas. In convention, hot part of a fluid rises, and the cooler part sinks
Answer:
C
Explanation:
A chemical reaction occurs when 2 white solids are stirred together. They turn into a slushy, white solid and the glass jar feels really cold. Energy is being _________ by the solids, which means this is an _______ reaction.
A) Released, exothermic
B) Absorbed, endothermic
C) Released, endothermic
D) Absorbed, exothermic
Answer:d
Explanation:
A chemical reaction occurs when 2 white solids are stirred together. They turn into a slushy, white solid and the glass jar feels really cold. Energy is being Absorbed by the solids, which means this is an Endothermic reaction. Hence option B is correct.
What is Endothermic and exothermic reaction ?Endothermic reaction is a reaction in which energy is absorbed from the surrounding in the form of heat. for example an ice cube takes energy from the surrounding and it melts to form liquid. In this melting of Ice energy is absorbed in the form of heat. In this process the phenomenon is going from high order(solid) to lower order(liquid), hence entropy is increasing in this case. Entropy is nothing but randomness of molecule.
Because of absorption of energy, change in enthalpy is negative.
Exothermic reaction is a reaction in which energy is released in the surrounding in the form of heat. for example bursting of firecracker gives sound and heat energy and its temperature is greater than surrounding. In this process Energy is released in the surrounding. In this case entropy decreases( solidifying of water into ice is also example of endothermic reaction).
Because of release of energy, change in enthalpy is positive.
Hence option B is correct.
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The temperature of a gas is a measure of how hard its molecules hit the walls
of its container. true or false
Answer:
i might be wrong but i think its
FALSE srry if im wrong TwT
Explanation:
The statement is false; temperature measures the average kinetic energy of gas molecules, whereas pressure is related to the force and frequency of collisions against the container's walls.
The statement that the temperature of a gas is a measure of how hard its molecules hit the walls of its container is false. Instead, the temperature of a gas is proportional to the average translational kinetic energy of the gas molecules.
When the kinetic energy increases, the molecules move faster, which could lead to harder impacts and more frequent collisions with the walls of the container, but the temperature itself does not directly measure impact force. Conversely, pressure of a gas is related to the frequency and force of the molecules colliding with the container walls. The more collisions and the harder they are, the higher the pressure. These collisions are the resultants of the gases’ kinetic energy and the volume available for the gas molecules to move around.
If the statement is true, select True. If it is false, select False.
If outside forces such as friction are negligible, when two objects of the same mass collide and do not stick together, the objects multiply velocities.
True
False
Answer:
false
Explanation:
Gravitational force is directly related to mass and inversely related to distance. So the bigger the masses the greater the force and the greater the distance the smaller the force. According to the model, which sphere has the greatest gravitational attraction to sphere D?
Q:
A:
Answer:Well according to the formula :
Fg = G • m1 • m2
__________
r^2
If one were to increase the masses of the objects it will have a direct impact on the gravitational force as well, as it increase the gravitational force. It is directly proportional to mass.
Distance on the other hand is inversely proportional to the gravitational force, basically increasing the distance between two objects of substantial mass causes a decrease of attraction or gravitational force between those 2 bodies of mass.
Explanation:
Answer:
C) Sphere C because it is larger than A and closer than B.
the goat weighs 900 N and is 1 meter from the fulcrum. The strongman pulls down on the lever 3 meters from the fulcrum. What is the smallest effort that the strongman can use to lift the goat.
Answer: The smallest effort = 300N
Explanation:
Using one of the condition for the attainment of equilibrium:
Clockwise moment = anticlockwise moments
900 × 1 = 3 × M
Where M = the weight of the strong man
3M = 900
M = 900/3 = 300N
Therefore, 300N is the smallest effort that the strongman can use to lift the goat
Answer:
Just over 300 N
Explanation:
Just over 300 N
Explanation: The goat is 1 meter from the fulcrum, and the strongman is 3 meters from the fulcrum. The mechanical advantage of the lever will be 3. The effort needed to lift the goat will be just over one-third the weight of the goat, in this case just over 300 newtons.
A bowling ball has an initial momentum of +30 kg m/s and hits a stationary bowling pin. After the collision, the bowling ball leaves with a momentum of +13 kg • m/s. What is the magnitude of the final momentum of the bowling pin if it has a mass of 1.5 kg? 0 kg • m/s 11 kg • m/s 17 kg • m/s 43 kg • m/s
Answer:
Momentum of the bowling pin is 17kgm/s
Explanation:
P(initial of ball)=+30 kg m/s
P(initial of pin)=0 because its velocity is 0
P initial = P final
30= P(ball) + P(pin)
30=13+P(pin)
P(final of pin)=+13 kg m/s and P(final of ball)= 30-13=17kgm/s
The scenario involves conservation of momentum. The bowling ball transfers momentum to the pin during collision, and the final momentum of the bowling pin is calculated to be 17 kg m/s.
Explanation:The scenario described in the question involves the principle of conservation of momentum. This principle, fundamental in physics, states that the total momentum of a system of objects is constant unless acted upon by an external force. Thus, the total momentum before the collision (initial momentum of the bowling ball) should equal the total momentum after the collision (final momentum of the bowling ball plus the momentum of the pin).
Given that the bowling ball has an initial momentum of +30 kg m/s and final momentum of +13 kg m/s, the momentum transferred to the pin is 30 kg m/s - 13 kg m/s = 17 kg m/s. This is the magnitude of the final momentum of the bowling pin.
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57:23
Look at the diagram showing resistance and flow of
electrons.
Which labels best complete the diagram?
X: High resistance
Y: Low resistance
Z: Flow of electrons
X: Low resistance
Y: Flow of electrons
Z: High resistance
X: Flow of electrons
Y: High potential energy
Z: Low potential energy
X: Low potential energy
Y: High potential energy
Z: Flow of electrons
N
Answer:
X: Low potential energy
Y: High Potential energy
Z: Flow of electrons
Explanation: From the figure, it's obvious that Z is the flow of electrons, as shown by the arrow demonstrating the direction of the flow. Because of this, we can easily nullify choices B and C.
From the figure, we can notice that Y has more energy stored and X has a lot less, so you can conclude that Y has high potential energy while X has low potential energy.
Which of the following is a potential explanation to resolve the Fermi paradox?
A. The numbers in the Drake equation are incorrect.
B. There is actually life on the Galilean moons of Jupiter.
C. There are fewer stars in the universe than we think there are.
D. Aliens are intentionally isolating us or refusing to communicate with us.
The Fermi paradox can potentially be explained by the idea that aliens are deliberately not contacting us. Other theories suggest rare intelligent life, undetectable communications, or self-destruction of advanced civilizations.
Explanation:A potential explanation to resolve the Fermi paradox is that aliens are intentionally isolating us or refusing to communicate with us (Option D). This concept suggests that advanced civilizations may make it a practice not to interfere with planets harboring immature, developing species such as humans. Other resolutions refer to life being common while intelligent life is rare, the possibility that invisible streams of data are beyond our detection capabilities, or the theory that civilizations self-destruct upon reaching a certain technological level. Considering the Drake Equation, each term estimates the likelihood of alien civilizations, but many values are guessed due to our limited knowledge. Discoveries of exoplanets affirm the prevalence of planetary systems, contributing to this debate.